Question About How Boost Controllers Work.

It says "For example, even though the wastegate's spring is set at 6psi, with a boost controller set to 10psi, the boost controller will bleed out 4 psi and send a 6psi signal back to the wastegate. If it goes higher, the wastegate opens, and boost levels out."

if a wastegate is set to 6 psi, it means that it will NOT allow it to create more than that for moe than a split second.

the wastegate sees pressure via a vacuum line off the map/intake manifold area. once 6 psi has been reached and is shown, the wastegate will open how ever much is NECESSARY to bleed out the exahust gases BEFORE they spin the turbine wheel, so that no more exhaust flow hits it to spin it. of course, this happens so fast, and its on of on part off on all within 1 sec.

now, when you throw a boost controller into the mix....
basically, what it does is it tricks the wastegate.

by the same example, your wastegate spring is still 6psi, and the boost controller is set to 10 psi.

now, what the boost controller does is it gets Inline between the reading from the map/IM vacuum and the wastegate and basically, sends the waste gate a false signal. it "bleeds out" the vacuum to the wastegate, so that it thinks its only hitting say 4 psi at 8psi on the boost controller, so that it will continue to generate boost and not open the wastegate until the boost controller sees 10 psi. now, the bosot controller sees 10 psi and it lets a 6 psi signal back to the wastegate, so it opens/maintains that boost level.
remeber, as you rev up, more exhaust gas flows out, thus spinnign the turbine wheel faster and faster. if there was nothing to release some of this, the turbo would spin until you boosted like 12312312 psi and blew up
haha